MacBook Air is not booting

I have a MacBook Air with Mac OS X Leopard (10.5). I am trying to boot the system and I can not.
The problem is that when the system boots and i am inserting my passcode it accepts the code and it starts the booting to the desktop screen, but instead of that after some minutes the system returns again and asking me my pass code.
What is the proplem what i have to do?
Thank you.

after pressing the start button ...
i am inserting my code..
i press enter, it accepts the code and i am waiting to this screen for some minutes..
and finally it return again on picture 2 that is asking for the code again..

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